Sand-blast-barrel loading



April 23, 1929. HULL 1,710,479

SAND BLAST BARREL LOADING Filed Jan. 22, 1926 5 Sheets-Sheet April 23, 1929. F. J. HULL SAND BLAST BARREL LOADING Filed Jan. 22,- 1926 5 Sheets-Sheet 2 April 23, 1929. F. J. Hl JL.L 1,710,479

SAND BLAST BARREL LOADING Filed Jam 22, 1926 S-Sheets-Sheet 3 April 23, 1929.

J. HULL SAND BLAST BARREL LOADING Filed Jan. 22, 1926 5 Sheets-Sheet 4 April 23, 1929. F. J. HULL S AND BLAST BARREL LOADING Filed Jan. 22, 1926 5 Sheets-Sheet .lllllll/A Patented Apr. 23, 1929.

uurrsn STATES PATENT orrice.

FOSTER JJ HULL, 0F HAGER'STOWN, MARYLAND, ASSIGNOR T0 PANGIBORN CORPORA- TION, OF HAGERSTOWN, MARYLAND, A CORPORATION OF MARYLAND.

'SAND-BLAST-BARREL LOADING.

Application filed January 22, 1926. Serial No. 83,034.

In cleaning castings by means of the sand blast machine, an important source of "expense in the form of labor, and delay result-- ing in loss of the operatingv time of the machine, is that incident to handling the castings in loading the machine. The cost of labor for this purpose and the reduction of the productive period of the machine together are in many instances a considerable item.

The present invention relates to poweroperated loading apparatus whereby the bulk oi the expense for hand labor and the loss of time in loading are eliminated. The invention also includes details of the machine whereby it is adapted to the use of the powerloading means,some of which details are of importance independently of the power loading means.

The subject-matter of the invention comprises a loading receptacle referred to in the trade as a skip which is transported in any suitable manner. In the form shown it is suspended from and carried by a travelling crane, being filled from a supply of castings in any convenient position, hoisted and car'- ried by the crane to the machine and brought int-o aposition in which it dumps directly into the barrel of the machine. The apparatus shown includes means for guiding the skip into dumping position, the said guides being preferably on the front of the machine.

The guides lead to an abutment which determines the dumping position. In the form shown these members co-oper-ate with follower means as rollers on the skip, the skip being otherwise provided with a locking suspension mechanism which supports it in upright position and by which it is reieased at the will of the operator when the skip is in dumping position, the release of the suspension lock in this position serving to dump the skip.

For the purpose of power filling, the apparatus is provided in addition to the guiding means, etc, with a special door in the machine casing which, while it completely closes and seals the machine casing during opera tion, opens so as to expose the filling and dumping opening of the barrel at the top of the machine, so that the castings may be dumped from the skip directly into the barrel without handling. The features thus outlined'and other features and details con tributing to the power-loading operation 'th'oughsome of them'are capable of being otherwise utilized, and all of them are capable of being widely varied, constitut'ethe subject-matter of the invention.

In the accompanying drawing 1 have illustrated a sand blast apparatus of the direct pressure rotary barrel type, the same being equipped with a power feed and being constructed and provided with features and details adapting it to the use of the power-feed ing operations in accordance with the preferred form of the invention.

In the -drawings I Figure l is a side view in the nature of an assembly of a sand blast barrel apparatus showing the power feed includingloading skip, crane and hoist, and other features of the machine contributing to the power l'eed.

Figure 2 is a rear elevation of theskip or car, the suspension for the same and the suspension lock which holds the car normally upright position and prevents dumping Y lock released, the dumping skip or car, etc,

being omitted for convenience of illustration.

Figure 4 is a side elevation of the dumping skip and suspension, the skip being shown in upright position or position of equilibrium with the suspension locked. v

Figure 5 is a perspective view of the skip or car dumped and shown in dumping position.

Figure 6 is a section through the suspension shaft showing one of the locking shives from the inner side.

Figure 7 is a section through the casing on a plane at right angles to the axis of the barrel showing the barrel in side elevation with the casing door and actuating means in elevation. This view is taken in the opposite direction from that of Figure 1.

Figure 8 is a front view of the sand blast nane apparatus, the casing door being shown part enclosed within the casing 3, the barrel being filled or charged by means of a loading car or skip a suspended from the hoist 5 of a travelling crane 6 by means of dumping and locking suspension 7.

More particularly in the apparatus as shown the barrel 2 is rotated by any suitable means as gearing 9 to turn the castings and present their different surfaces, and streams of abrasive and air under pressure are injected into the barrel and directed against the exposed surfaces of the castings, the abrasive streams entering at the ends by way of nozzles 8. The castings to be cleaned are introduced into the barrel and removed by way of barrel door opening 10 closed by the barrel door or cover 11. i

The barrel being turned to the position illustrated, particularly in Figure 1, with the door opening 10 in the upper forward quadrant, this portion of the barrel is uncovered, so that the castings may be poured or dumped into the barrel from and by the power-operated feed to be described. The barrel door opening is exposed by and through casing door filler opening 1212 located in the front and front top portion of the casing, and closed to seal the casing and prevent the escape of dust and abrasive by the loading door 145, the same comprising an arcuate plate 15 of somewhat less than 90 hinged to the casing at the top at 16 to swing upwardly in opening, as shown in Figure 1, and downwardly to closed position as shown in Figure 7. The filler door also includes a flat plate 17 having a hinged con nection at its upper edge at 18 to and with what is in the closed position the lower edge of the arcuate plate 15. This plate hangs straight downward in closed position, closing the front of the casing below thearcuatc plate and from a point just above the horizontal plane of the centre of the barrel to the bottom of the casing. In open position the plates are automatically folded over on each other as shown in Figure 1 giving a large opening at the top and upper portion of the front side with a comparatively short radius of swing. The door is conveniently operated for filling by means of a hand crank and chain gearing, and connections adjacent the front of the machine, as illustrated in'Figure 1.

The connections as shown include a sarocket 20 which ma r be ooerated b I hand is secured to the shive at the bottom of the groove near the centre of the shive, the other end of the chain being connected to the arouate member 15 of the filler door which closes the opening in the casing, the chains being, as shown, passed over upright radial supports 31 on the doors and secured at their ends re mote from the shives to the edge of the door at 32 which is adjacent the hinge 18 and which edge is the swinging or lower edge in the closed position of the door.

In Figure 8 I have also shown a check or stop chain 33 secured at one end to any fixed point as cross-bar 34, which extends from one upright 27 to the other at the rear, and at its other end to the shaft 25, the winding of the check or stop chain on the shaft serving to limit the operation of the chain gearing and prevent breakage or distortion of the door by drawing it back beyond normal full open position. The stop chain may also serve to stop the operation of the sprockets and chains in the closed position of the door, the stop chain being wound up on the shaft 'first in one direction, then unwound and wound up in the other direction as the door is operated'by means of the gearing 20, etc. The door may be locked or'supported in open position in any suitable manner. In the form of the invention shown this locking is accomplished by meansof a pin or bolt 36, which to lock or support the door in open position is inserted in bolt hole 3'? in the sprocket casing 38, see Figure 1, the pin being in this way passed through the casing and through one of the open links of the chain 22, thereby locking the parts and pre venting all motion of the door-operating mechanism until the pin is removed. 'The door is locked in open position by the operator, the barrel being likewise stopped in loading position, as shown in Figure 1, just before the skip is brought into operative relation with the front of the machine as hereinafter described. 7 p

The loading receptacle or skip 1 with the locking suspension 7 have been referred to herein in a general way. The skip or loading car and suspension are illustrated in Figures 1, 2, 3, 1, 5 and 6. The skip 1, as illustrated.

and in the preferred form, though some of,

lit)

the details are not essential, is a scoop-like 7 member ha vin a flat bottom 1-0, straight sides 4-1, a rear wall as which is inclined upwardly and baclnvardly, the front end being completely open at 4-3 for convenience in filling and dumping, and the front edges 44 of the side walls being inclined upwardly and to the rear parallel to the rear a l 42 for conven ience in entering the sand blast machine as illustrated in Figure 1 to accomplish the power-loading operation as outlined in the preamble. The loading skip is not only provided with the suspension 7 to be more fully described, by which it is hoistedand carried by means of a travelling crane or othersuitable device, but is also provided with two rollers or followers 45, which while they may be referred to as primarily intended to cooperate with abutment 58 and tracks 46 and 47 at the front of the machine in loading, also serve in connection with the single wheel or roller 48 at the rear, to support the skip, so that it may be run on a floor or track.

The followers orrollers are in the form of the invention shown mounted on a shaft or axle 5O securedto the bottom of the skip or loading receptacle or car in any suitable wall, and its only function is to support the rear of the skip when it rests on the floor or other supporting surface. The rear wheel may be pivoted to swing casterwise if desired. The tracks 46 1 nd. 47 as shown are secured to the inner surfaces of the front pro ect1ng side Walls of the casing. These tracks pre-'- sent inwardly projecting surfaces'56 at right angles to the side walls, and they may be in the form of angle irons or anyshapes suitable to this purpose.

fT'he tracks 46 on each side extend upward vertically from the bottom of the machine, being spaced backward fronrthe front edge of the casing by a sufficient distance'to provide side guides as well as supports for contact with the peripheral surfaces of followers orrollers 45, the details not being essential. At a suitable height, which as shown is somewhat belo'wthe centre of the barrel, these tracks are curved backwardly toward the barrel, forming an arcuate portion 57 which is nearly 90,though this curve may be of any form to suit the purpose. This arc-uate portion terminates in an upright track 58 which serves as an abutment to stop the forward motion of the skip and to impart a rotary tendency in the direction of dumping. This track may extend upwardly to the top of the side walls. The second track 47 engages the oppositev sidesof the rollers from that engaged by the track 46 and begins at the upper portion of the casing ust above the arcuate portion 57 of the first or inner track.

portion 60 of the track 47, the same being spaced from the upright or abutment portion 58 of the track 46 by a distance a little greater thanthe outside diameter of the rollers 45.

The locking suspension 7 in the preferred form as shown, someof the details not being essential, comprises slings 62, one on each side of the skip. These slings consist each of a short chain. Each of these chainsis secured at each end by suitable clamping means 63, 64 to two respective fixed points 011 the corresponding sides of the skip, the point 63 being spaced from the front and the point 64 being near the rear of the skip, the arrangement being preferably such that the skip when loaded has a slight tendency to tip forward, which tendency is restrained by the lock to be described.

" The slings 62 co-operate each with one of the shives 66 over which they are passed. Therois one of these shives on each end of an axle 67 which is carried in the'suspension body 68. This member 68 is provided with eyes 69 near its respective ends connected in the form of the invention shown by chains 70 to aring 71 adapted to be engaged by a hook 72 on the cable of the hoisting element 5 'ofthe travelling crane 6. I

' The suspension body 68 carries at each side of its centre a bolt 7 3 which slides in the direction of the length of the axle, each bolt beingmounted in a suitable guide 74, one

respective ends of the swinging arm 75, the

offsets being toward the opposite sides of the housing, so that the bolts move simultaneously in opposite directionsas lever 75 is operated.

Each of the shives 6611s shown is provided with a keeper notch on its inner face, see Figure 6, also Figures 2 and 3, and a circular guide or shoulder 81 by which the bolt is led into the keeper notch. One side of the notch 80, i. e., that which is forward in the direction of dumping, as shown, is preferably rcinforced by a hardmetal shoulder 82, the remainder of the shive being of cast iron or other comparatively cheap and easily worked metal. a Each of the shives 66 is grooved atv84 to guide the chain, and each chain is provided with a ball 85 or other positioning member secured thereto intermediately of its length, the bulk of the ball being in line with the chain, the chain being shown as secured to opposite axial ends of the ball, and each of the shive's' is provided with a socket '86 in the nature of an enlargement of the groove, the sockctbeing adapted to receive and position the ball, or other positioning member, holding the skip in upright or loaded position, substantially as illustrated in Figure 4., the balls and sockets being correspondingly located for this purpose. The bolts are actuated by means of a controller arm 87 extending outwardly to the operators side of the machine, i. e., to the left of the operator in facing the machine from the filling side. This transverse arm 87 may be secured to the swinging or the toggle arm intermediately thereof and preferably at right angles thereto as shown. The controller arm 87 is also shown as extending to the right beyond the toggle arm 75 and carrying a counter-weight 88 which tends to normally hold the parts in locked position, the shives being unlocked and the bolts released by a downward pull on the lef hand end of the arm 87 to which a chain 89, see Figure 2, is connected for convenience of the operator. A pull on the chain serves to swing the actuating arm 87 and release the bolts, permitting the skip if unbalanced to dump as illustrated in Figure 1.

In the operation of the machine, the cleaning of a charge or load of castings having been completed and the castings dumped, the casing door 14: is opened, as shown in Figure 1, by rotating the handcrank 21 and actuating the chain gearing, rolling up the chains 30 on the shives 29, and swinging the door to the position shown in Figure 1, where it is stopped by the stop chain 33, and locked by inserting the pin 86 in the hole 37 in the gear casing 38, the pin being thus passed through one of the open links of the chain and held in fixed position in the casing, whereby the chain and door are held as shown in-Figure 1. The barrel is then rotated to the position shown, in which the barrel opening 10 is disposed toward the casing door opening 12 so as to be in convenient alignment therewith for the purposes stated.

The skip or loading car 1 is then filled with castings to be cleaned or other articles to be treated by the sand blast. The skip may be filled by scooping or shovelling or by means of a chute. The skip is then hoisted in any suitable manner as by means of trave ling crane 5, 6 and carried in suspension to thesand blast machine, or it may be handled by any available means.

For the purposes of loading, the skip is caused to approach the front of the machine, the rollers or followers 45 being brought into contact with the inside vertical tracks 46 below the outer track 457, each roller 15 being enthe centre of the barrel. The skip is then hoisted and the rollers 15 move upward along track 16 and then traverse the arcuate portion 57 and contact abutment 58, both tracks performing a guiding function. The skip is thus guided to the location in which it is The skip having been thus guided by the" tracks to a position with its forward end or nose 43 in or over the opening 10 in the barrel, and rollers 15 engaging abutment 58 with the hoist preferably drawing the suspension slightly forward, the operator releases the latch 7 5, withdrawing the bolts 73 from the keeper notches by throwing the lever 87, which on account of the height of this lever above the fioor,may be provided with a pull chain 89 by which the lever is most conveniently engaged for this purpose by the operator. .Tl1e latch having been released, the skip being on account of the engagement'of the rollers with the abutments 58' and being other.-

wise on account of the position of the slings 62 and the shives 66, unbalanced, and having a tendency to rock forward to the position shown in Figure 1, swings forward to clumping position as shown, and the castings are dropped by gravity into the barrel. The operator then eases the hoist, unwinding a few inches of cable, and the-rollers 45 being partially supported on the portion 57'of the track in the position shown inFigurc 1, the

skip rocks back to the upright position or the I position of equilibrium shown in lligure .4, and the balls roll back into the sockets 86, and the actuating lever 87 being counter-bah anced by the weight 88 as described, the bolts 73 are returned to the keeper notches 80 which are thus brought in ali nment with the bolts, and the skip or car being again locked in equilibrium, may be returned to the point of supply of castings or other materials vbeing treated for the purpose of refilling.

I have thus described specifically and in detail a sand blast barrel apparatus equipped with the power loading appliance of my invent-ion, and the features and details contributing to the operation of the loading appa ratus, in order that the natur and method of application of the invention may be clearly understood; however, the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being defined in the claims.

What I claim and desire to secure by Let ters Patent is:

1. In a sand blast barrel apparatus a barthrough the opening into the barrel which is provided with a filling opening which may be brought into registration with the casing door opening for this purpose.

2. A sand blast machine having a rotary barrel, a casing enclosing the barrel, thebarrel having a filling opening in the side with means for closing the same, and the casing having a door and door opening exposing an upper quadrant of the barrel, the casing door comprising an arcuate plate hinged to the casing at the top, and a second depending plate hinged to the swinging end of the arcuate plate.

3. A sand blast machine having a rotary barrel, a casing enclosing the barrel, the barrel having a filling opening in the side with means for closing the same, andv the casing having a door and door opening exposing an upper quadrant of the barrel, the casing door comprising an arcuate plate hinged to the casing at the top, and a second depending plate hinged to the swinging end of the arcuate plate, which latter swings upwardly in opening so thatthe two plates are in effect folded toward each other, the swingof the door being thereby reduced as compared to the length ofthe opening exposed.

4. In a sand blast barrel apparatus, a casing having a door opening exposing the entire front half of the barrel, the door for said opening comprising an arcuate plate hinged to the casing at the top rear of the door opening, and a depending plate hinged to the swinging end of the arcuate plate.

5. Ina sand blast barrel apparatus, a casing having a door opening exposing an upper portion of the barrel, the door for said opening comprising a plate hinged to the casing, a depending plate hinged to the swinging end of the first plate, and manually actuated gearing for swinging the first plate upwardly about its hinged edge.

6. In a sand blast barrel apparatus, a casing havinga door opening exposing an upper portion of the barrel, the door for said openingcomprising an arcuate plate hinged to the casing, a depending plate hinged to the swing- I ing end of the arcuateplate, and manually actuated gearing for swinging the arcuate plate upwardly about its hinged edge, and

means for locking the gearing to hold the door in open position.

7. In a sand blast barrel apparatus, a casing having adoor opening exposing an upper portion of the barrel, the door for said opening comprising a plate hinged to the casing, a

depending plate hinged to the swinging end of the first plate, manually actuated gearing for swinging the first plate upwardly about its hinged edge, and a stop limiting the operation of the gearing. 8. In a sand blast barrel apparatus, a casing having a door opening exposing the barrel, the door for said opening comprising a plate hinged to the casing at the top rear of the door opening, a depending plate hinged to the swinging end of the hinged plate, and

manually actuated chain gearing for swinging the hinged plate upwardly about its hinged edge, means for locking the gearing to I hold the door in open position, and a stop chain limiting the operation of the chain gearing and determining the scope of operation of the chain gearing to prevent straining of the door.

9." A sand blast barrel apparatus, a casing having a door opening over the top of the barrel and infront of thebarrel, a door for closingthe opening comprising a plate pivoted at the upper rearward edge of the opening, and means for swinging said plate comprising a rotary shaft with a shive, a chain connected to the shive to be wound up thereon, chain gearing for rotating the shaft, manually actuated means for operating the chain gearand a second chain connected to the shaft 111, to be wound up as the door is opened, the

chain being also connected to a fixedpoint to act as a stop to limit the movement of the door 1n openlng.

Signed by me at Hagerstown, Maryland,

this 20th day of January, 1926. r

FOSTER J.'HULL. 

